Disney starlet Demi Lovato is caught on camera snorting cocaine in a shocking booze and drugs binge – that’s the shocking charge being made to RadarOnline.com.

A friend who witnessed the 18-year-old do lines of coke at a party in North Richland Hills, Texas, told RadarOnline.com: “Demi was belligerent, being slutty and doing coke all over the house. The guy who hosted the party shot multiple videos of this and what I’ve seen with my eyes, Demi is screaming, ‘F**k all of you, I’m famous, I don’t care what any of you think of me the whole world loves me.’ He shot her in the bathroom as she was finishing a line (of cocaine).”

RadarOnline.com has not viewed the tape, which is being shopped to various media outlets, despite repeated requests.

Lovato was on an international tour as a special guest of the Jonas Brothers, but left the tour over late last month to enter an undisclosed facility, to be treated for “emotional and physical issues she has dealt with for some time”, her rep said.

This blockbuster video development follow concerns voiced to RadarOnline.com by well-placed sources that Demi – who is star of Disney’s Camp Rock movies and the sitcom Sonny With a Chance – has been acting erratically in recent months.

One source told us: “Demi has been partying way too hard.”

But when asked about claims of drug use, a source close to Lovato insisted to RadarOnline.com: “We have not heard anything about drugs… nothing.”